Combination clamp and drift pin



Jean. 5, 1932. A. Q, NASH COMBINATION'CLAMP AND DRIFT PIN Filed Jan: 24,1950 Patented Jan. 5, 1932 UNITED, STATES PATENT or-HCE@ -f ALEXANDER e.NASH,y or` CINGINATI, onro; GEORGE w. smEvEivsoN, ADMNrs'rRAroR or sAIDALEXANDER o. NAzsmDEoEAsED, AssreivoRmo CIRCULAR CONCRETE con TArNnRcoRroRAronorenvoiNNArr omo; .AcoRroaArIon or omok COMBINATIONCLAMP 'ANDDRIFT DIN Application'pmdfranary 24, 1930: 's eriaim. 423,1?1. f

This `invention is directed toV aoombination the jaws into 3kclampingrelation ywith the clampand drift pin designed more particularly for usein connection in assembling and relatively fixing the sections of'shell' molds usedin cement orlike molding.

ln building structures of cement or like plastic material it is usual toprovide a shelllike mold Vto receive vand form the plastic material,and, particularly in large constructions, these shell molds arermade upof sec tions with edges ofangle-iron' orlikereinforcement. In previousconstructions these sections of the mold are assembled `and held inmold-forming relation by'bolts passed through openings in theoutstanding mai gins ofthe angle-iron yedges and held by nuts ctightened on the bolts during .the molding operation. rlhe timerequir'edto plac'eand remove `the Vnuts and `bolts,to say nothing ofthedifiiculty incident to holding/the sections in proper relation toyaline ythegbolt holes of 'adjacent sections, rendered theV work ofassembling and dismantling the molds ay diiii-l cult .and expensivedetailof the building operation.

The primary object of the present inven-L tionis to materially simplifyand reduce the time and expense of both assembling and dismantling theVmold sections through provision of a single element serving as acombined drift pin and clamp, and through the use of which the sectionsare assembled in proper relation by use of the drift pin-feature of Lthe element and the angle-iron elements of the sections secureiy'andrelatively clampedv to hold the mold sections in mold-forming relation,through which both the assembling and dismantling of the mold sectionsmay be carried out in a speedy and convenient manf ner, with aconsequent saving of timel and expense. j

The improvement, structurally considered,

.comprises an integral lelementformed tol pro- ;vide relativelyconvergent clamping jaws withY an extended handle, one of the jaws beingextended and provided with a ixed drift pin; so that the drift pin, whenused to draw the sections together thereafter becomes the pivot on whichthe element is rotated to force angle iron sections or free thesections.: i f The invention is'illustrated in the accompanyingdrawings,in which `i Fig. 1 is a perspective view, showing the improved 'clampingelement in operative relation with theangle-iron margins ofa moldsection` f j .Y 5. Fig. 2 is a planlof the same. l

Fig. 3 is an edge view of the same, the mold sections being showninsection.l f -1 Fig. 4 is a perspective view-.of he improved clamp. f i ff' Fig. 5 is atransverse section through the clamp in operativeposition.L

f The improved clamp comprisesan integral i metallic body l, having aU-shaped portion 2, the side walls of which, as 3 and 4, have theirinner-surfaces relatively convergent, as' indicated more particularly inFig.n5. The clamp includes a handle section, extended fromjthe Lupperpart of the UI-shaped portion, such between the side walls 3 and 4. Thisextension 6 isprovided withy arrigid driftfpin 7, projecting at rightangles to the plane of the extension', and of course tapering towarditsV free end.. The drift pin has a length exceeding the ytransversedimension of,v theclamp proper. f 'f nl j The improved-clamp, while ofcourse joa` pable and intended for any use tof which it may be put, isprimarilygdesigned for' posi'- tioning andclamping'fmoldsections inconcrete or like `moldingl Asf'illustrated such molds are ymadeupofsheet metalV sections'S, having angle-iron reinforcements 9` at theirmarginal edges. Theseangle "irons are 'se y 'cureditopresent anoutstanding! flange y10, and in assemblingthe sections 8, theflanges lO,both vertically and horizontallyfofthe sections are placed in contactand are designed to be secured together, both in annular formation andin superimposed relation. These flanges 10 are formed with openings 11,and in assembling the sections, as heretofore roposed, these openings ofthe respective anges l0 are brought into proper relation b drift pinaction, and bolts passed through such aligned holes and secured by nuts.The difiiculty of holding the holes in the flanges 10 aligned after useof the drift pin and while inserting the bolts, together with the timeconsuming operation of applying the bolts and nuts in assembling andremoving same in dismantling, added a very material expense to theultimate molding operation.

The resent improvement avoids all the difficulties, and so reduces thetime necessary to the operation, as to render the assembling anddismantling a comparatively minor item of time or ex nse. In use, whenthe sections are initially arranged in proper relation, the drift pin isdriven through the appropriete holes in the meeting flanges l0, and suchholes brought into alignment, thus properly` positioning the adjacentmold sections. hen, without removing the drift pin amlthereby holdingthe sections of the mold in their roper relation, the clamp as a wholeis turned) on the drift pin as a pivot, and the jaws of the clamp forcedto embrace the meet-y ing flanges 10. This operation, by reason of theconve nce of the walls of the portion 2 :ifA the c amp, forces theflanges 10 into fixed-and close contact, and secures the mold sectionsin desired relation. Of course, the separation of the clamp, whendismantling the sections, is carried out in an obvious inan- The clampthus provides for drift-pin ar rangement of mold sections and subsequentclamping of such sections in fixed relation in a simple speedyoperation, requiring only a s'uicient number of the clamps and a memberfor driving the drift pins, and the clamps can be continually reused.The clamps are of course to be constructed of rugged metal to stand thespecified usage, though they may be of any size requisite for theparticular mold. The handle 5 is sufliciently stron'g to rmit driving,thus insuring that force may e used if desired to insure a properclamping action even under a slight distortion of the anges 10, as mayin fact occur in repeated use of the mold sections. The handle, byreason of the plane of its projection relative to the clamping section2, will, when in clamping relation, rest closely adjacent the free edgesof the angle-iron sections 10, as shown in Fig. 1, thus avoiding undueprojection, while at the saine time permitting free lw tothe handle forremoving the clamp when desired.

Having thus described the invention, what is claimed as new, is

l. A combined clamp and centering pin for use in aligning the bolt holesin the flanges of moldin sections and for clamping said sections withrelation to each other after bolt hole ali nment including a memberhaving jaws to orm a clamp for the flanges, and a cylindrical taperedpin depending from one of said jaws to cooperate with and align the boltholes of superimposed flanges and to serve as a ivot pin for theoperation of the clamp fol owing such aligning function.

2. A combined clamp and centering pin including an element formed toprovide clamping jaws, and a cylindrical tapered pin carried by theelement wholly beyond the clamping jaws whereb the pin may be used as acentering pin without jaw interference and thereafter serve as a pivotfor clamping movement of the jaws.

3. A clamp including a U-shaped clamping section providing clampingjaws, one of the jaws being extended, and a cylindrical tapering pinfixed in such jaw extension.

4. A combined clamp and centering pin operating to center the bolt holesin the lateral flanges of superimposed molding sections and to clamp theflanges together, comprising a clamping member formed to embrace thesuperimposed flanges and clamp them in fixed relation, and a pin carriedby said member of cylindrical tapered form, said pin being operative toinitially and perfectly align the bolt holes of the superimposed flangesand following such aligning operation serve as a pivot for the operativemovement of the clamp with respect to such flanges while maintaining thealigned relation of the bolt holes.

In testimony whereof .l affix my signature.

ALEXANDER Q. NASH.

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